The answer is letter a. Hill terrain, hill slope, and hill elevation
Atomic mass Ca = 40.078 u.m.a
40.078 g --------------- 6.02x10²³ atoms
121 g ------------------- ??
121 x ( 6.02x10²³) / 40.078 =
7.28x10²⁵ / 40.078 = 1.81x10²⁴ atoms
Since all atoms favor reacting in a way that gives them the same valence electron configuration as a noble gas (the last column on the right of the periodic table), sodium will lose 1 electron, while chlorine will gain one electron.
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63.546 miles of copper,Cu,are in 19.2g of copper